To what pressure in psi can a fitting made of 95% copper be hydro tested up to?

The appropriate pressure to which a fitting made of 95% copper can be hydrostatically tested is indeed 600 psi. When conducting hydrostatic tests, the maximum test pressure for copper fittings often aligns with industry standards, which dictate that copper's strength and ductility make it suitable for pressures up to this threshold.

Copper fittings, due to their favorable material properties, can handle significant pressures, but testing beyond 600 psi could risk compromising the integrity of the fitting or cause unsafe conditions. Material science dictates that while copper is robust, excessive pressure testing can lead to failure due to stress or deformation. Thus, sticking to the industry-recommended limit ensures safety and the reliability of the system being tested, affirming that 600 psi is a safe and accepted testing limit for such fittings.